From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 567B7C28EB4 for ; Thu, 6 Jun 2019 18:59:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 360A22083D for ; Thu, 6 Jun 2019 18:59:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=fb.com header.i=@fb.com header.b="V/UdCPxN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728217AbfFFS7R (ORCPT ); Thu, 6 Jun 2019 14:59:17 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:59534 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726762AbfFFS7Q (ORCPT ); Thu, 6 Jun 2019 14:59:16 -0400 Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x56ImXUo006416 for ; Thu, 6 Jun 2019 11:59:15 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=facebook; bh=bYqo/eKrf3Ocv2LivjDpADlZygx+fChjmeNZSWE8V/Y=; b=V/UdCPxNihvBEPMt56NRxdzPLBD9jMDWjKtcp8VLxCvBwyeQTU8l6nxBT9e2z7oVjv0v 865pXeUDpCL3mB5TJ4LJptONdUgoNwUjqnKvdKL0HCR4TjdFxU51LvOey4n/JNPwlVLj 2ml3IXysA1l9X/9UgaWMHgcBwRfQRJ7zQ9o= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com with ESMTP id 2sy1quhngn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 06 Jun 2019 11:59:15 -0700 Received: from mx-out.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:82::c) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Thu, 6 Jun 2019 11:59:14 -0700 Received: by devvm2643.prn2.facebook.com (Postfix, from userid 111017) id 821D412D781C4; Thu, 6 Jun 2019 11:59:12 -0700 (PDT) Smtp-Origin-Hostprefix: devvm From: Roman Gushchin Smtp-Origin-Hostname: devvm2643.prn2.facebook.com To: Alexei Starovoitov , Daniel Borkmann , CC: , , Roman Gushchin , Yonghong Song Smtp-Origin-Cluster: prn2c23 Subject: [PATCH bpf-next] bpf: allow CGROUP_SKB programs to use bpf_get_current_cgroup_id() helper Date: Thu, 6 Jun 2019 11:59:11 -0700 Message-ID: <20190606185911.4089151-1-guro@fb.com> X-Mailer: git-send-email 2.17.1 X-FB-Internal: Safe MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-06_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906060127 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently bpf_get_current_cgroup_id() is not supported for CGROUP_SKB programs. An attempt to load such a program generates an error like this: libbpf: 0: (b7) r6 = 0 ... 8: (63) *(u32 *)(r10 -28) = r6 9: (85) call bpf_get_current_cgroup_id#80 unknown func bpf_get_current_cgroup_id#80 There are no particular reasons for denying it, and we have some use cases where it might be useful. So let's add it to the list of allowed helpers. Signed-off-by: Roman Gushchin Cc: Yonghong Song Cc: Alexei Starovoitov Cc: Daniel Borkmann --- net/core/filter.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index 55bfc941d17a..19724bb1860d 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -5919,6 +5919,10 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) return &bpf_sk_storage_get_proto; case BPF_FUNC_sk_storage_delete: return &bpf_sk_storage_delete_proto; +#ifdef CONFIG_CGROUPS + case BPF_FUNC_get_current_cgroup_id: + return &bpf_get_current_cgroup_id_proto; +#endif #ifdef CONFIG_INET case BPF_FUNC_tcp_sock: return &bpf_tcp_sock_proto; -- 2.20.1